Gwen Stefani told Gavin Rossdale about pregnancy via email

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"By the way, you had another kid. I was surprised," Stern said to Rossdale, according to Us Weekly. "I thought you were done."

"Me, too," Rossdale joked, adding that he found out about their third child in a non-traditional way. "I got this email on the road, from Gwen, and the title was in capitals, 'LOOK WHAT YOU DID TO ME NOW.' I was like, 'What is this?' My blood pressure went through the roof. And I opened the email and it was the pregnancy stick."

Just last week, Stefani also admitted she thought they were done having babies. She told Seth Meyers that her son asked her, "'Mom, are you gonna have a baby? I want you to have a baby.' I was like, 'It's over. We're not having anymore. This is our family.'"

The Voice coach gave birth to her and Rossdale's third child, Apollo Bowie Flynn, back in February. Because of his tour schedule, Rossdale knows exactly when their baby was conceived. He explained, "I wasn't home that often, but I did go home for Father's Day. And that gives Father's Day a new meaning."